Forward-on-forward high dynamic range architecture for digital micromirror devices

Patent metadata

Field	Value
Publication number	US-9983402-B1
Application number	US-201715434635-A
Country	US
Kind code	B1
Filing date	Feb 16, 2017
Priority date	Feb 16, 2017
Publication date	May 29, 2018
Grant date	May 29, 2018

Abstract

A forward-on-forward high dynamic range architecture for digital micromirror devices device is provided. In particular, provided herein is a device that includes two digital micromirror devices (DMDs), each operated in a forward configuration, such that each is illuminated at a respective non-normal angle and a respective output image is reflected at a normal angle, a subject plane of a first DMD being parallel to the first DMD. Optics between the DMDs are configured to convey light reflected from the first DMD to illuminate an image plane at a second DMD in the forward configuration, the optics including an equivalent lens plane. At least one optical device between the DMDs is configured to: tilt the subject plane of the first DMD to an equivalent tilted subject plane, the equivalent lens plane, the equivalent tilted subject plane and the image plane all intersecting at a Scheimpflug intersection.

First claim

What is claimed is:

1. A device comprising:
a first digital micromirror device (DMD) and a second DMD each operated in a forward configuration, such that each is illuminated at a respective non-normal angle and a respective output image is reflected at a normal angle, a subject plane of the first DMD being parallel to the first DMD;
optics between the first DMD and the second DMD, the optics configured to convey light reflected from the first DMD to illuminate an image plane at the second DMD in the forward configuration, the optics including an equivalent lens plane; and
at least one optical device between the first DMD and the second DMD, the at least one optical device configured to: tilt the subject plane of the first DMD to an equivalent tilted subject plane such that the image plane at the second DMD is in uniform focus at the respective non-normal angle, the equivalent lens plane, the equivalent tilted subject plane and the image plane all intersecting at a Scheimpflug intersection.

2. The device of claim 1 , wherein the at least one optical device includes a prism with an exit face at an angle tilted relative to the subject plane of the first DMD.

3. The device of claim 1 , wherein the at least one optical device includes a plurality of wedge prisms distributed between the first DMD and the second DMD.

4. The device of claim 1 , wherein the at least one optical device includes a prism configured to convey illumination light to the subject plane of the first DMD at the respective non-normal angle and convey the respective output image through an exit face of the prism, the exit face at an angle relative to the subject plane, the angle being greater than zero, and the angle selected to optically tilt the subject plane of the first DMD to the equivalent tilted subject plane.

5. The device of claim 1 , wherein the optics includes a prism configured to convey illumination light from the first DMD to the image plane of the second DMD at the respective non-normal angle and convey the respective output image of the second DMD through a respective exit face.

6. The device of claim 1 , wherein the optics includes one or more lenses.

7. The device of claim 1 , wherein the optics includes one or more apertures.

8. The device of claim 1 , wherein the first DMD is further operated in a pre-modulator mode and the second DMD is further operated in a prime-modulator mode.

9. The device of claim 8 , wherein the first DMD is modulated using first image data, and the second DMD is modulated using second image data determined from one or more of the first image data, a target projected image and a pixel spread function of the device.

10. A device comprising:
a first digital micromirror device (DMD) and a second DMD each operated in a forward configuration, such that each is illuminated at a respective non-normal angle and a respective output image is reflected at a normal angle, a subject plane of the first DMD being parallel to the first DMD;
optics between the first DMD and the second DMD, the optics configured to convey light reflected from the first DMD to illuminate an image plane at the second DMD in the forward configuration, the optics including an equivalent lens plane; and
at least one optical device between the first DMD and the second DMD, the at least one optical device configured to: tilt the subject plane of the first DMD to an equivalent tilted subject plane, the equivalent lens plane, the equivalent tilted subject plane and the image plane all intersecting at a Scheimpflug intersection,
wherein the at least one optical device includes a prism configured to convey illumination light to the subject plane of the first DMD at the respective non-normal angle and convey the respective output image through an exit face of the prism, the exit face at an angle relative to the subject plane, the angle being greater than zero, and the angle selected to optically tilt the subject plane of the first DMD to the equivalent tilted subject plane.

11. The device of claim 10 , wherein the at least one optical device is further configured to: tilt the subject plane of the first DMD to the equivalent tilted subject plane such that the image plane at the second DMD is in uniform focus at the respective non-normal angle.

12. The device of claim 10 , wherein the optics includes a prism configured to convey illumination light from the first DMD to the image plane of the second DMD at the respective non-normal angle and convey the respective output image of the second DMD through a respective exit face.

13. The device of claim 10 , wherein the optics includes one or more lenses.

14. The device of claim 10 , wherein the optics includes one or more apertures.

15. The device of claim 10 , wherein the first DMD is further operated in a pre-modulator mode and the second DMD is further operated in a prime-modulator mode.

16. The device of claim 15 , wherein the first DMD is modulated using first image data, and the second DMD is modulated using second image data determined from one or more of the first image data, a target projected image and a pixel spread function of the device.

Assignees

• Christie Digital Systems Usa

Inventors

• Jackson John David
• Perkins Michael
• Lamm Mark
• Ma Joseph

Classifications

• G03B21/008

  using micromirror devices · CPC title

• H04N9/312

  Driving therefor (driving of electronic spatial light modulators in displays other than projection devices G09G3/34, G09G3/36; control of liquid crystal elements G02F1/133; control of micromechanical modulators G02B26/08) · CPC title

• H04N9/3102 Primary

  using two-dimensional electronic spatial light modulators (micromechanical modulators as such G02B26/0833; liquid crystal modulators as such G02F1/13) · CPC title

• G03B21/147

  Optical correction of image distortions, e.g. keystone · CPC title

• H04N9/3126

  for spatial light modulators in series · CPC title